Updating `cards` from sources external to Pomodoro Logger

[smcnally]

Is your feature request related to a problem? Please describe.

I'd like to update existing Pomodoro Logger cards and records from timestamp and board info I have from other sources like Markdown comments in code, server and app logs, other time trackers used.

Describe the solution you'd like

capturing core time-spent per card

My primary focus is capturing session times spent for given board and card. Application and app switching info will become a focus after I have solved for capturing core time-spent per card.

I can pass boards name, cards title, and session timestamps info. I would like Pomodoro Logger to calculate spentTimeInHour, merge that with existing data, and handle the required updates to records and elsewhere.

Describe alternatives you've considered

Imports and export.json

Import Data works great.
I'm working on manual updates to pomodoro-logger-exported-data.json for Import while reviewing dataMerger and posting this Issue for guidance and suggestions.

Additional context
I have sample data, screenshots, and code WiP to share and I'm happy to clarify or amplify details here. Thank you for sharing Pomodoro Logger and for your time and attention here.